Induce Despair is a common Instant card from Rise of the Eldrazi (ROE), collector number 114. Current market price: $0.07 (foil $0.22), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, reveal a creature card from your hand. Target creature gets -X/-X until end of turn, where X is the revealed card's mana value.